Well-drilling bit



moved try-.removing Iany one or the cotter pins and unscrewing the nuts on the part have its cutting; edge contiguous to the cut4 ting edges 2l, but to proiect below the same. This islaccomplished b the manner in which the. point is Sharpener and shaped.` lt will be noticed that the entire lower edges as well as the vertical side edgesici the bit ferm a continuous cutting' element. Vl bit of this kind will cut through any kindot material and will not ,swing out of line. @i course., whenever the peint member lll is sharpened the'wings are also sharpened so as to keep the proper relation between the parts. rl`his bit cannot clog up and will be very fast in its worlL/"l'lie point member may be specially treated and may,1 be formed 0l a particular kind of metal so as to stand the I constant cutting and centering action. lt

is obvious that either wing or the point may 'be removed. whenever desired.

.j 27 firmly secure the wings in the head Iand 'member whereby the parts are more securely united and the point member 1s braced' the whole structure is as compact and rigid as iiil it Awas made in one piece7 so far as its operationis concerned. l

llt is pointed out that the seats 24treceive diametrically opposite corners of the point against twisting and breaking oil. 1

What I claim, is: 1.- ln a drill bit, a head, removable-wings -depending from the head, and a removable point depending from the head between the wings andv projectingbelow the wings, the wings having continuelle cutting edges ,along their sides and bottoms, contiguous to'- the point,

2. ln a well drilling hit, a head having c sockets, diametrica-lig,7 opposite drill wings The shanlrs disposed betweenthe wings and centrally of the drill, the point member having a drilling point extending below the cutting edges cf the wines, said point member contacting vith the wings throughout the length of the atter.

3. ln a well drillingbit, a head having a central soclretiand sockets ven each side of the central socket, wings each having an upwardly extending shank fitting in one of the side sockets ofthe head, means for fastening the Shanks of the wings in the head, a point member having its upper portion fitting in the central soclzetol the head, the wings having seats for receiving the point 'member which is disposed therein and centrally of the bit, and means for fastening' the point member in the head. I A

d. :in a well drilling bit, a head having' a centralI socket and sockets on each side of the central socket, wings each having an up wardly extending shank iitting in one of the side sockets of the head7 means for fastov tening the Shanks of the wings in the head,

a point member having its upper portion itting in the central socket of the head', the wings having seats for` receiving the point member which is disposed therebetween Lcentrally of the bit7 and means for fastening the point member in the head, the wings having vertical cutting edges,with receding faces and downwardly inclined ycutting edges on their undersides contiguous to the vertical cutting edges, the point member having a drilling point projecting below the inclined edges and sharpened with a cut-A ting edge contiguous to the inclined cuttingi edges of the wings.

ln testimony whereof Il aliix signature'.

reiteraron e: Minen'rr. 

